Franklin Collection Service, Inc. Fraudulant collections Tupelo Mississippi

I had been an AT&T customer for many years up until last year. I moved to a new home and requested to have AT&T transfer all their services to the new home. After they attempted to connect services, they notified that they would not be able to provide those services. I then cancelled the request and returned the modem. They assured me that the account was closed. Yesterday I received a letter from Franklin Collection Service requesting that amount that AT&T had voided due to inability to provide service. I called AT&T accounting and they assured me that that account had been closed since last year. They also stated Franklin Srevices is not one of the companies that they use.